Separate quality manager related classes into separate files

cura/Machines/QualityNode.py

@@ -0,0 +1,35 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import Optional
+
+from .ContainerNode import ContainerNode
+from .QualityChangesGroup import QualityChangesGroup
+
+
+#
+# QualityNode is used for BOTH quality and quality_changes containers.
+#
+class QualityNode(ContainerNode):
+
+    def __init__(self, metadata: Optional[dict] = None):
+        super().__init__(metadata = metadata)
+        self.quality_type_map = {}  # quality_type -> QualityNode for InstanceContainer
+
+    def addQualityMetadata(self, quality_type: str, metadata: dict):
+        if quality_type not in self.quality_type_map:
+            self.quality_type_map[quality_type] = QualityNode(metadata)
+
+    def getQualityNode(self, quality_type: str) -> Optional["QualityNode"]:
+        return self.quality_type_map.get(quality_type)
+
+    def addQualityChangesMetadata(self, quality_type: str, metadata: dict):
+        if quality_type not in self.quality_type_map:
+            self.quality_type_map[quality_type] = QualityNode()
+        quality_type_node = self.quality_type_map[quality_type]
+
+        name = metadata["name"]
+        if name not in quality_type_node.children_map:
+            quality_type_node.children_map[name] = QualityChangesGroup(name, quality_type)
+        quality_changes_group = quality_type_node.children_map[name]
+        quality_changes_group.addNode(QualityNode(metadata))